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From POTS to PANS: A Commentary on the Evolution to Internet Telephony
May/June 1999 (vol. 3 no. 3)
pp. 83-91

The central assumption of the plain old telephone service (POTS) was network-based computing power and dumb end systems. Implementing the pretty amazing new services (PANS) of IP-based telephony requires a shift in services at the network perimeter.

Citation:
Christos A. Polyzois, K. Hal Purdy, Ping-Fai Yang, David Shrader, Henry Sinnreich, François Ménard, Henning Schulzrinne, "From POTS to PANS: A Commentary on the Evolution to Internet Telephony," IEEE Internet Computing, vol. 3, no. 3, pp. 83-91, May-June 1999, doi:10.1109/4236.769426
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